public RecordingCommands(MusegicianData db) { this.db = db; }
public SongCommands(MusegicianData db) { this.db = db; }
public ArtistCommands(MusegicianData db) { this.db = db; }
public AlbumCommands(MusegicianData db) { this.db = db; }
public PlaylistCommands(MusegicianData db) { this.db = db; }